Coffee mill



FIG. 1 is a front elevational view of a coffee mill, showing my new design;

FIG. 2 is a right side elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is an exploded perspective view thereof. 

The ornamental design for a coffee mill, as shown. 